mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-09-19 17:04:09 +00:00
113 lines
3.8 KiB
Python
113 lines
3.8 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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from collections import defaultdict
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from tornado.web import Application
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from tfw.networking import MessageSender
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from tfw.networking.event_handlers import ServerUplinkConnector
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from tfw.networking.server import EventHandlerConnector
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from tfw.config.logs import logging
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from .zmq_websocket_handler import ZMQWebSocketProxy
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LOG = logging.getLogger(__name__)
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class TFWServer:
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def __init__(self, fsm_type):
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self._fsm = fsm_type()
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self._fsm_updater = FSMUpdater(self._fsm)
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self._fsm_manager = FSMManager(self._fsm)
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self._fsm.subscribe_callback(self._fsm_updater.update)
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self._event_handler_connector = EventHandlerConnector()
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self.application = Application(
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[(r'/ws', ZMQWebSocketProxy, {'make_response': self.make_response,
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'proxy_filter': self.proxy_filter,
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'handle_trigger': self.handle_trigger,
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'event_handler_connector': self._event_handler_connector})]
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)
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#self.controller_responder = ControllerResponder(self.fsm) TODO: add this once controller stuff is resolved
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@property
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def fsm(self):
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return self._fsm
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@property
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def fsm_manager(self):
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return self._fsm_manager
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def make_response(self, message):
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self.trigger_fsm(message)
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message['FSMUpdate'] = self._fsm_updater.get_fsm_state_and_transitions()
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return message
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def handle_trigger(self, message):
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LOG.debug('Executing handler for trigger "%s"', message.get('trigger', ''))
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self.trigger_fsm(message)
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def trigger_fsm(self, message):
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trigger = message.get('trigger', '')
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try:
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self._fsm_manager.trigger(trigger, message)
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except AttributeError:
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LOG.debug('FSM failed to execute nonexistent trigger: "%s"', trigger)
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def proxy_filter(self, message):
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# pylint: disable=unused-argument,no-self-use
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return True
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def listen(self, port):
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self.application.listen(port)
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class FSMManager:
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def __init__(self, fsm):
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self._fsm = fsm
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self.trigger_predicates = defaultdict(list)
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self.messenge_sender = MessageSender()
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@property
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def fsm(self):
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return self._fsm
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def trigger(self, trigger, message):
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predicate_results = []
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for predicate in self.trigger_predicates[trigger]:
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success, message = predicate(message)
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predicate_results.append(success)
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self.messenge_sender.send('FSM', message)
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if all(predicate_results):
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try:
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self.fsm.trigger(trigger, message=message)
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except AttributeError:
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LOG.debug('FSM failed to execute nonexistent trigger: "%s"', trigger)
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def subscribe_predicate(self, trigger, *predicates):
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self.trigger_predicates[trigger].extend(predicates)
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def unsubscribe_predicate(self, trigger, *predicates):
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self.trigger_predicates[trigger] = [predicate for predicate in self.trigger_predicates[trigger]
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not in predicates]
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class FSMUpdater:
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def __init__(self, fsm):
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self.fsm = fsm
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self.uplink = ServerUplinkConnector()
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def update(self, kwargs_dict):
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# pylint: disable=unused-argument
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self.uplink.send(self.generate_fsm_update())
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def generate_fsm_update(self):
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return {'key': 'FSMUpdate',
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'data': self.get_fsm_state_and_transitions()}
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def get_fsm_state_and_transitions(self):
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state = self.fsm.state
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valid_transitions = [{'trigger': trigger} for trigger in self.fsm.machine.get_triggers(self.fsm.state)]
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return {'current_state': state, 'valid_transitions': valid_transitions}
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